ROLLING BEARING UNIT FOR DRIVING WHEEL AND DRIVING UNIT FOR WHEEL

摘要

PROBLEM TO BE SOLVED: To prevent deformation of a spline hole 13 formed on a central part of a hub 4c at the time of plastically deforming a cylinder part 37 formed on an inner end part of the hub 4c so as to press it on an inner end surface of an inner ring 5 externally fitted on the inner end part of the hub 4c. SOLUTION: An inner peripheral surface of the cylinder part 37 and an inner end part of the spline hole 13 are continued to each other by an inclined surface part 39. A cross-section circular arc chamfering part 35 is formed on an inner peripheral surface of the inner end part of the inner ring 5. A boundary position α of the inner peripheral surface of the cylinder part 37 and the inclined surface part 39 is positioned outward in the axial direction by -1.0 to 3.0 mm from an outer end part position β of the chamfering part 35.